fix: Preserve type signature of annotated async functions

[edgarrmondragon]

Version 2.4.0 (14bb92f) typed on_exception/on_predicate as Callable[[Callable[P, T]], Callable[P, T]], using ParamSpec/TypeVar to reconstruct the decorated callable's type.

For an async def function, mypy sees its real type as Callable[P, Coroutine[Any, Any, T]]. Reconstructing that type through the decorator's signature made mypy re-elaborate the Coroutine[Any, Any, T] generic, and disallow_any_decorated flagged its two Any parameters.

This is a regression from 2.2.1, which had typed the decorator as a plain identity transform (Callable[[_CallableT], _CallableT], _CallableT bound to Callable[..., Any]).

Closes #200

[read-the-docs-community]

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